Patent US3783519A successfully refreshed from Google Patents.
US3783519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drawing apparatus
Assignee: Individual
•
Filing: 1971-01-13
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Granted: 1974-01-08
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Expires: 1991-01-13
Abstract
Abstract Perspective effects in the basic lines of a technical drawing are obtained either by means of a transparent sheet marked with lines and placed on a drawing board illuminated from behind, or by use of a drawing board provided with a pivotable rule mounted on an arm that can be moved in a vertical direction, control means being provided so that the rule will alter direction and be aligned with one ''''vanishing point'''' over the whole vertical traverse of the supporting arm.
Inventors
- 👤 D Sartori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:20
CPC Classifications
B; B43; B43L; B43L11/00; B43L11/02; B43L11/04; B43L13/00; B43L13/02; B43L13/08; B43L13/14
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
219 words
An apparatus for drawing perspective views, comprising: a table having a lower hollow housing supported on adjustable leg means; a lid pivotally attached along a forward edge of said housing; said lid having spaced, translucent plates at the forward side thereof, between which a translucent panel is adapted to be placed, and an opaque panel pivotally mounted at the rear side of said lid; said translucent panel having a basic matrix cross-lining thereon to afford axial lines and vanishing lines having a predetermined angle in all field depths; said lid having lighting means thereon between said plates and said opaque panel; the latter being pivotal to occupy one position to close off the rear portion of said lid, to be lowered to another position adjacent said housing to expose the rear of said plates, to allow the projection of images from a projector mountable on said housing; strut means for supporting said lid in an inclined working position; and force compensating means interposed between said lid and said housing for facilitating the raising of said lid and providing a retarding force as said lid is closed; the latter further having an elongated recessed portion extending outwardly from one of the vertical sides thereof, and a mechanism for controlling support of a drafting device slidably mounted in said recessed portion.
Claim 2
Independent Claim
219 words
An apparatus for drawing perspective views, comprising: a table having a lower hollow housing supported on adjustable leg means; a lid pivotally attached along a forward edge of said housing; said lid having spaced, translucent plates at the forward side thereof, between which a translucent panel is adapted to be placed, and an opaque panel pivotally mounted at the rear side of said lid; said translucent panel having a basic matrix cross-lining thereon to afford axial lines and vanishing lines having a predetermined angle in all field depths; said lid having lighting means thereon between said plates and said opaque panel; the latter being pivotal to occupy one position to close off the rear portion of said lid, to be lowered to another position adjacent said housing to expose the rear of said plates, to allow the projection of images from a projector mountable on said housing; strut means for supporting said lid in an inclined working position; and force compensating means interposed between said lid and said housing for facilitating the raising of said lid and providing a retarding force as said lid is closed; the latter further having an elongated recessed portion extending outwardly from one of the vertical sides thereof, and a mechanism for controlling support of a drafting device slidably mounted in said recessed portion.
Claim 3
Dependent Claim
73 words
The drawing apparatus as defined in claim 1, wherein said lid further includes, behind said translucent plates, a roll of paper the web of which extends through a slot; aNd further comprising paper cutting means incorporated in said lid, the paper to be fed onto the working surface of an outermost plate past said paper cutting means; said lid also including a shutter mounted on a spring drum, to cover the working surface.
Claim 4
Dependent Claim
40 words
The drawing apparatus as defined in claim 1, wherein said strut means includes a double crutch pivoted on said hollow housing, including a cross-piece on which rests said opaque panel, upon disengagement thereof from said rear portion of the lid.
Claim 5
Dependent Claim
59 words
The drawing apparatus as defined in claim 1, further comprising a support arm slidable above said translucent panel; and wherein balancing means is mounted on said lid, formed by a counterweight connected to the ends of a cable which is tensioned by a spring and guided by pulleys; said cable being secured to each side of said support arm.
Claim 6
Dependent Claim
53 words
The drawing apparatus as defined in claim 4, wherein said lid further includes a scale secured substantially perpendicular to said support arm and having notches therein; and a spring-loaded pin extending from said support arm, cooperating with said notches in the scale in order to provide spaces stopped positions of said support arm.
Claim 7
Independent Claim
238 words
An apparatus for drawing perspective views, comprising in combination: a support table having a translucent panel thereon adapted to be illuminated from behind and constituting a drafting board, said panel having a basic matrix cross-lining thereon to afford axial lines and vanishing lines, and said lining appearing through a sheet of paper disposed on said panel; a vertical first guide rail fixably secured to one edge of said table; an angularly adjustable second guide rail pivotally secured to one end of said first rail; adjusting means on the other end of said first rail for adjusting the angular position of said second rail relative to said first rail; a support arm extending over said panel, slidably mounted on said first rail; a pitman slidably mounted on said support arm for movement in a direction perpendicular to said first rail; said pitman having one end slidably mounted on said second rail, and its other end pivotally connected to a connecting rod, the latter being pivotally mounted on said support arm; and a drafting rule adjustably secured to said connecting rod; wherein, when said support arm is displaced over said panel along said first rail, said pitman slides laterally thereof due to the angular orientation of said second rail, and pivots said connecting rod and said drafting rule such that lines drawn along said rule, in all vertical positions of said support arm, will meet at substantially one vanishing point.
Claim 8
Independent Claim
238 words
An apparatus for drawing perspective views, comprising in combination: a support table having a translucent panel thereon adapted to be illuminated from behind and constituting a drafting board, said panel having a basic matrix cross-lining thereon to afford axial lines and vanishing lines, and said lining appearing through a sheet of paper disposed on said panel; a vertical first guide rail fixably secured to one edge of said table; an angularly adjustable second guide rail pivotally secured to one end of said first rail; adjusting means on the other end of said first rail for adjusting the angular position of said second rail relative to said first rail; a support arm extending over said panel, slidably mounted on said first rail; a pitman slidably mounted on said support arm for movement in a direction perpendicular to said first rail; said pitman having one end slidably mounted on said second rail, and its other end pivotally connected to a connecting rod, the latter being pivotally mounted on said support arm; and a drafting rule adjustably secured to said connecting rod; wherein, when said support arm is displaced over said panel along said first rail, said pitman slides laterally thereof due to the angular orientation of said second rail, and pivots said connecting rod and said drafting rule such that lines drawn along said rule, in all vertical positions of said support arm, will meet at substantially one vanishing point.
Claim 9
Dependent Claim
100 words
The drawing apparatus as defined in claim 6, wherein said connecting rod is coupled by a spring-biased, retractable pin to a pivotable, graduated disc having an index and a knob mounted thereon and being secured to said drafting rule; said knob having means mounted thereon to establish horizontal positioning of said rule when said second guide rail is disposed parallel to the axis of said first guide rail; said retractable pin permitting, when disengaged, free axial rotation of said disc relative to said index for angular orientation of said rule; and means for locking said disc in any angular position.
Claim 10
Dependent Claim
45 words
The drawing apparatus as defined in claim 7, further comprising a resilient lever engageable in said knob and carrying a pin; said knob being notched in its periphery for cooperation with said pin, for effecting said horizontal positioning of the rule after free rotation thereof.
Claim 11
Dependent Claim
34 words
The drawing apparatus as defined in claim 7, further comprising an intermediate plate fast with said disc, so that said rule is angularly adjustable relative to the horizontal by means of said intermediate plate.
Claim 12
Dependent Claim
77 words
The drawing apparatus as defined in claim 6, wherein the edge of said rule is provided with a recess permitting the engagement of drafting stencils having complementary profiles for the purpose of preventing the disengagement thereof, said edge of the rule also being provided with a detachable graduated strip mounted at a small distance therefrom, and a member slidably and lockably mounted on said strip, said member having a retractable stop mounted thereon for engaging said stencil.
Claim 13
Dependent Claim
85 words
The drawing apparatus as defined in claim 10, further comprising matrices for drawing ellipses of standardized dimensions, said matrices having a longitudinal symmetry axis permitting them to be turned over, centering apertures on said symmetry axis permitting the adjustment thereof by reference marks, said matrices being formed along their transverse edges with bulges constituting points for abutment on said rule when they are used in a perpendicular position, there also being provided at least one graduation on at least one longitudinal edge of said matrices.
Claim 14
Dependent Claim
59 words
The drawing apparatus as defined in claim 6, wherein said adjusting means includes a plate secured to said first guide rail and including several positioning notches for the engagement and centering of mating, manually operable retaining means secured to the end of said second guide rail, and wherein the latter is locked at its free end by said plate.
Claim 15
Dependent Claim
30 words
The drawing apparatus as defined in claim 12, further comprising a handle on said rule, and wherein said retaining means includes control means acting by rotation exerted on said handle.
Claim 16
Dependent Claim
19 words
The drawing apparatus as defined in claim 6, further comprising means for balancing the apparatus during the displacement thereof.
Claim 17
Dependent Claim
60 words
The drawing apparatus as defined in claim 6, wherein the angular orientation of said rule relative to said connecting rod permits the drawing of parallel lines when said at least one rail is disposed parallel to the axis of said vertical guide, and of lines converging substantially to a point when the same rail is disposed obliquely to said guide.
Claim 18
Dependent Claim
47 words
The drawing apparatus as defined in claim 6, wherein the coupling point between said pitman and said connecting rod is adjustable with respect to the pivot of the latter, for adjusting the angular amplitude of the movement of said rule during vertical displacement of said support arm.
Claim 19
Dependent Claim
56 words
The drawing apparatus as defined in claim 6; wherein one end of said pitman is formed as a rack and said connecting rod has thereon a pinion engaging said rack, the profile of said pinion being such as to correct movement of said rule so that lines drawn on the edge thereof converge to one point.
Claim 20
Dependent Claim
33 words
The drawing apparatus as defined in claim 6, further comprising braking means secured to said support arm, which acts on said vertical guide to permit locking of the apparatus at a desired height.
Claim 21
Dependent Claim
53 words
The drawing apparatus as defined in claim 6, wherein said support arm is formed with a spring-loaded pin co-operating with notches formed at regular intervals in a fixed scale, for allowing vertically controlled displacement of said arm, and providing spaced stopped positions of said support arm for the drawing of interlining and shading.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |